// Copyright 2016 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "src/base/file-utils.h"

#include <stdlib.h>
#include <string.h>

#include "src/base/platform/platform.h"

namespace v8 {
namespace base {

    char* RelativePath(char** buffer, const char* exec_path, const char* name)
    {
        DCHECK(exec_path);
        int path_separator = static_cast<int>(strlen(exec_path)) - 1;
        while (path_separator >= 0 && !OS::isDirectorySeparator(exec_path[path_separator])) {
            path_separator--;
        }
        if (path_separator >= 0) {
            int name_length = static_cast<int>(strlen(name));
            *buffer = reinterpret_cast<char*>(calloc(path_separator + name_length + 2, 1));
            *buffer[0] = '\0';
            strncat(*buffer, exec_path, path_separator + 1);
            strncat(*buffer, name, name_length);
        } else {
            *buffer = strdup(name);
        }
        return *buffer;
    }

} // namespace base
} // namespace v8
